Yes.. that's the way logic works. The trick is not arguing with someone that your car is definitely there, because you have no way of knowing for sure.
Yes, but when someone tries to tell me that my car is not there, or tries to persuade others that my car is not there, I may need to stop them.
There are two obvious ways to do that. One is to argue with them, citing facts and evidence. The other is simply to punch their lights out. I assume that, since you avoid arguing, you use the second exclusively?
Perhaps I can phrase the Bigfoot question in a way that both satisfies your sense of epistemology and at the same time makes the utter vacuity of your position clear. "The Bigfoot body is a hoax, because the probability of Bigfoot existing is smaller than that of every car in the United States being stolen simultaneously." (I can state this with complete confidence, because we know car thefts do occur and we have nothing but negative evidence about Bigfoot, as well as several well documented scientific proofs of hoaxes.)